What are the best poractices for safely restoring a mirror pool in passthrough?

[Farout]

@juspolo

Are there potential issues with drive recognition due to the passthrough setup that I should be aware of?

Yes, see: Resource - "Absolutely must virtualize TrueNAS!" ... a guide to not completely losing your data. | TrueNAS Community

Also there seems to be an ongoing issue of Proxmox auto importing the Truenas Pool and corrupting it!

Can't import datapool

IIRC there is currently a bug / bad design decision in proxmox where it auto-imports zpools into the host OS. If the zpool is currently imported / in use in a guest as well this will cause pool corruption. ZFS is not a clustered filesystem and so it cannot be consumed by both host and guest simultaneously. IIRC the only way to avoid the data corruption is HBA passthrough. @HoneyBadger has more details.